APA-Zitierstil (7. Ausg.)

Beer, C. E., & Wiersma, D. (1970). Irrigated corn yields in the North Central Region of the United States. Iowa State Univ.

Chicago-Zitierstil (17. Ausg.)

Beer, C. E., und Dan Wiersma. Irrigated Corn Yields in the North Central Region of the United States. Ames, Iowa: Iowa State Univ, 1970.

MLA-Zitierstil (9. Ausg.)

Beer, C. E., und Dan Wiersma. Irrigated Corn Yields in the North Central Region of the United States. Iowa State Univ, 1970.